What molecules can produce more energy per gram than sugars and are used for storing energy in animals?

A. carbohydrates

B. proteins

C. lipids

D. hydrocarbons

The answer is C: Lipids. Because:

1 gram of carbohydrates provides 17 kJ of energy per gram.

1 gram of protein provides 17 kJ of energy per gram.

1 gram of fat provides 37 kJ of energy per gram.

Hydrocarbon is a fuel so it is not stored in animals.

The answer is lipids